For those of you that are considering running two arrangers at the same time, get on the phone with your manufacturer, your dealer, your dealer rep, anyone you can...
And ask them for standardized MIDI codes for Variation, Fills, Intros and Endings. It is disgraceful, here in the 21st century, after nearly thirty years of MIDI being around, that you STILL can't trigger two different arranger engines at the same time.
What you guys are discussing here is using the RH sounds from one arranger with the style section of another. But imagine how much BETTER it would be if you could combine different style parts from different arrangers... An almost infinite variety of styles would be possible, just from the permutations between two sets of ROM styles. Pick and chose the best of each. Shore up the weak areas of one arranger with the strong points of another...
That you CAN'T do this right now simply because the manufacturers WILL NOT get together and decide a simple standard is pathetic. Every arranger out there (or at least, most of them) has the codes to do this. BUT THEY ARE ALL DIFFERENT, AND ALL HARDWIRED.
It's time to change this, my friends.... But only YOU can bring this about. It is patently obvious the manufacturers don't care one iota. Make some noise...
_________________________
An arranger is just a tool. What matters is what you build with it..!